A view of hydrogen bonds is present in the structure as shown in Figure 4. Selected bond lengths and angles
for hydrogen bonding are summarized in Table 3.
Figure 4.
View of the N-H···O hydrogen bonding in structure [NiL](ClO
4
)
2
.
Table 3.
Selected hydrogen bonds for [NiL](ClO
4
)
2
[Å and
o
].
D-H...A
d(D-H)
d(H...A)
d(D...A)
<(DHA)
N(2)-H(2)...O(2)#1 0.894(17) 2.177(19)
3.030(3)
159(2)
N(1)-H(1)...O(4)#2 0.878(17)
2.35(2)
3.031(3)
135(2)
N(1)-H(1)...O(1)
0.878(17)
2.56(2)
3.134(3)
124(2)
#1 -x+1,-y+1,-z #2 -x+1,-y+2,-z
Visible spectra
The electronic spectral data (Figure 5.) of yellow complex, [NiL](ClO
4
)
2
which is soluble in DMSO show
absorption with the
O
max
= 452 nm which means assigned to d – d transition of Ni(II) ions.
223
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